#include<bits/stdc++.h> 

using namespace std;

using ldbl = long double;
using ll   =   long long;

const ldbl delta = 1e-9; const int N = 10; ll m[N], n[N], t[N]; 

namespace timer
{
    typedef chrono::high_resolution_clock     Clock_t;
    typedef chrono::time_point<Clock_t>        Time_t;
    typedef chrono::microseconds          Time_scale_t;
 
    static Time_t present;
 
    inline void reset()
    {
        present = Clock_t::now();
    }
 
    inline ll elapsed_time()
    {
        auto past = present; reset();
 
        return chrono::duration_cast<Time_scale_t>(present-past).count();
    }
}

int main()
{
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr); 
    
    n[0] = 1, timer::reset();
    
    for(int j = 0; j < N; j++, n[j] = n[j-1]*10)
    {
        for(ldbl i_max = 1/ldbl(n[j]), i = 0; i <= i_max; i += delta)
            m[j]++;
    
        t[j] = timer::elapsed_time();
    }
    
    for(int j = 0; j < N; j++)
        cout << j << ": n = " << n[j] << ", ",
        cout << m[j] << " iteration(s), total loop execution-time = " << t[j] << " usec" << endl;
}